In most cases, I can assume The number of #tags in a post to be proportional to the ignorance of both the author who published it and the followers who share it. Once upon a time there was a concept called #netiquette. Any scientific study about this phenomenon?

It's weird in Instagram, those who likes my photos are the ones who doesn't follow me, discovered through hashtags or those who have same niche as the photo.
youtu.be/XIJ3t8sdeqw
While on YouTube, those who comment and like are my subscribers.
#seo#rank#tags#instagram